//#define  _CRT_SECURE_NO_WARNINGS 1
//#include<stdio.h>
//#include<assert.h>
//#include<stdio.h>
//void* my_memcpy(void* destination, const void* source, size_t num)
//{
//	assert(destination && source);
//	void* ptr = destination;
//	while (num--)
//	{
//		*((char*)destination) = *((char*)source);
//		(char*)destination = (char*)destination + 1;
//		(char*)source = (char*)source + 1;
//	}
//	return ptr;
//}
//int main()
//{
//	int arr1[10] = { 0 };
//	int arr2[] = { 4,7,8,9,11,1023,125 };
//	my_memcpy(arr1, arr2, 4 * sizeof(int));
//	for (int i = 0; i < 10; i++)
//	{
//		printf("%d\n", arr1[i]);
//	}
//	return 0;
//}